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CVE-2024-20399VulnerabilityPublished Updated

CVE-2024-20399: Cisco NX-OS Software · OS Command Injection

Affects Cisco NX-OS SoftwareSource CVE Database V5

0

Exploited in the wild · KEV due 23 Jul 2024 · 4% EPSS : apply the vendor's fix or mitigations to Cisco NX-OS Software now.

Data as of 26 Oct 2026, 08:30 UTC

CVSS 3.1 base score
6.0Medium
How severe the flaw is on the 0–10 CVSS scale.
KEV deadline
 US federal agencies must patch by this date; a sensible deadline for everyone else.
EPSS
4.3% chance of exploitation in 30 days – higher than 91% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 1 Jul 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: evidence found.

    Listed in CISA KEV 1 day after disclosure

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by Cisco Systems, Inc.

    , 236 days before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. , 1 day after disclosure

  4. KEV remediation due

    US federal deadline

    , 22 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Cisco Cisco NX-OS SoftwareAffected
  • =8.2
  • =8.4
  • =6.2
  • =9.2
  • =9.3
  • =8.1
  • =8.3
  • =8.0
  • =8.5
  • =10.1
  • =10.2
  • =10.3
  • =9.4
  • =10.4
Fixed in–

Check the firmware or software version for Cisco NX-OS Software in the device's admin interface against the vendor advisory.

Description

A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated user in possession of Administrator credentials to execute arbitrary commands as root on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of arguments that are passed to specific configuration CLI commands. An attacker could exploit this vulnerability by including crafted input as the argument of an affected configuration CLI command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with the privileges of root. Note: To successfully exploit this vulnerability on a Cisco NX-OS device, an attacker must have Administrator credentials. The following Cisco devices already allow administrative users to access the underlying operating system through the bash-shell feature, so, for these devices, this vulnerability does not grant any additional privileges: Nexus 3000 Series Switches Nexus 7000 Series Switches that are running Cisco NX-OS Software releases 8.1(1) and later Nexus 9000 Series Switches in standalone NX-OS mode

References

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